android - Logcat message: error opening trace file: No such file or directory (2) Can anyone help me? -
java code: public class splashactivity extends activity implements onclicklistener {
@override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.welcome); ////////////////////////////////////////////////////////////////////// //////// game menu ///////////////////////////////////////////////// button playbtn = (button) findviewbyid(r.id.playbtn); playbtn.setonclicklistener(this); button settingsbtn = (button) findviewbyid(r.id.settingsbtn); settingsbtn.setonclicklistener(this); button rulesbtn = (button) findviewbyid(r.id.rulesbtn); rulesbtn.setonclicklistener(this); button exitbtn = (button) findviewbyid(r.id.exitbtn); exitbtn.setonclicklistener(this); } /** * listener game menu */ @override public void onclick(view v) { intent i; switch (v.getid()){ case r.id.playbtn : //once logged in, load main page //log.d("login", "user has started game"); //get question set // list<question> questions = getquestionsetfromdb(); //initialise game retrieved question set /// gameplay c = new gameplay(); c.setquestions(questions); c.setnumrounds(getnumquestions()); ((chuckapplication)getapplication()).setcurrentgame(c); //start game now.. // = new intent(this, questionactivity.class); startactivityforresult(i, constants.playbutton); break; case r.id.rulesbtn : = new intent(this, rulesactivity.class); startactivityforresult(i, constants.rulesbutton); break; case r.id.settingsbtn : = new intent(this, settingsactivity.class); startactivityforresult(i, constants.settingsbutton); break; case r.id.exitbtn : finish(); break; } } /** * method retrieves random set of questions * database given difficulty * @return * @throws error */ private list<question> getquestionsetfromdb() throws error { int diff = getdifficultysettings(); int numquestions = getnumquestions(); dbhelper mydbhelper = new dbhelper(this); try { mydbhelper.createdatabase(); } catch (ioexception ioe) { throw new error("unable create database"); } try { mydbhelper.opendatabase(); }catch(sqlexception sqle){ throw sqle; } list<question> questions = mydbhelper.getquestionset(diff, numquestions); mydbhelper.close(); return questions; } /** * method return difficulty settings * @return */ private int getdifficultysettings() { sharedpreferences settings = getsharedpreferences(constants.settings, 0); int diff = settings.getint(constants.difficulty, constants.medium); return diff; } /** * method return number of questions game * @return */ private int getnumquestions() { sharedpreferences settings = getsharedpreferences(constants.settings, 0); int numrounds = settings.getint(constants.num_rounds, 20); return numrounds; } }
when hit play button, application stops. button has take new activity open quiz qith 4 option radio button connected sqlite database.
logcat messaege:
`05-14 09:57:07.126: d/dalvikvm(19541): gc_concurrent freed 189k, 12% free 2676k/3016k, paused 19ms+7ms, total 108ms 05-14 09:57:07.126: d/dalvikvm(19541): wait_for_concurrent_gc blocked 47ms 05-14 09:57:07.486: i/choreographer(19541): skipped 55 frames! application may doing work on main thread. 05-14 09:57:07.516: d/gralloc_goldfish(19541): emulator without gpu emulation detected. 05-14 09:57:10.116: d/androidruntime(19541): shutting down vm 05-14 09:57:10.116: w/dalvikvm(19541): threadid=1: thread exiting uncaught exception (group=0x40a71930) 05-14 09:57:10.146: e/androidruntime(19541): fatal exception: main 05-14 09:57:10.146: e/androidruntime(19541): java.lang.classcastexception: android.app.application cannot cast com.pixy.quiz.chuckapplication 05-14 09:57:10.146: e/androidruntime(19541): @ com.pixy.quiz.splashactivity.onclick(splashactivity.java:61) 05-14 09:57:10.146: e/androidruntime(19541): @ android.view.view.performclick(view.java:4204) 05-14 09:57:10.146: e/androidruntime(19541): @ android.view.view$performclick.run(view.java:17355) 05-14 09:57:10.146: e/androidruntime(19541): @ android.os.handler.handlecallback(handler.java:725) 05-14 09:57:10.146: e/androidruntime(19541): @ android.os.handler.dispatchmessage(handler.java:92) 05-14 09:57:10.146: e/androidruntime(19541): @ android.os.looper.loop(looper.java:137) 05-14 09:57:10.146: e/androidruntime(19541): @ android.app.activitythread.main(activitythread.java:5041) 05-14 09:57:10.146: e/androidruntime(19541): @ java.lang.reflect.method.invokenative(native method) 05-14 09:57:10.146: e/androidruntime(19541): @ java.lang.reflect.method.invoke(method.java:511) 05-14 09:57:10.146: e/androidruntime(19541): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 05-14 09:57:10.146: e/androidruntime(19541): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 05-14 09:57:10.146: e/androidruntime(19541): @ dalvik.system.nativestart.main(native method) 05-14 09:57:13.797: i/process(19541): sending signal. pid: 19541 sig: 9 ` my bdhelper class:
public class dbhelper extends sqliteopenhelper{
//the android's default system path of application database. private static string db_path = "/data/data/com.pixy.quiz/databases/"; private static string db_name = "questionsdb"; private sqlitedatabase mydatabase; private final context mycontext; /** * constructor * takes , keeps reference of passed context in order access application assets , resources. * @param context */ public dbhelper(context context) { super(context, db_name, null, 1); this.mycontext = context; } /** * creates empty database on system , rewrites own database. * */ public void createdatabase() throws ioexception{ boolean dbexist = checkdatabase(); if(!dbexist) { //by calling method , empty database created default system path //of application gonna able overwrite database our database. this.getreadabledatabase(); try { copydatabase(); } catch (ioexception e) { throw new error("error copying database"); } } } /** * check if database exist avoid re-copying file each time open application. * @return true if exists, false if doesn't */ private boolean checkdatabase(){ sqlitedatabase checkdb = null; try{ string mypath = db_path + db_name; checkdb = sqlitedatabase.opendatabase(mypath, null, sqlitedatabase.open_readonly); }catch(sqliteexception e){ //database does't exist yet. } if(checkdb != null){ checkdb.close(); } return checkdb != null ? true : false; } /** * copies database local assets-folder created empty database in * system folder, can accessed , handled. * done transfering bytestream. * */ private void copydatabase() throws ioexception{ //open local db input stream inputstream myinput = mycontext.getassets().open(db_name); // path created empty db string outfilename = db_path + db_name; //open empty db output stream outputstream myoutput = new fileoutputstream(outfilename); //transfer bytes inputfile outputfile byte[] buffer = new byte[1024]; int length; while ((length = myinput.read(buffer))>0){ myoutput.write(buffer, 0, length); } //close streams myoutput.flush(); myoutput.close(); myinput.close(); } public void opendatabase() throws sqlexception{ //open database string mypath = db_path + db_name; mydatabase = sqlitedatabase.opendatabase(mypath, null, sqlitedatabase.open_readonly); } @override public synchronized void close() { if(mydatabase != null) mydatabase.close(); super.close(); } @override public void oncreate(sqlitedatabase db) { } @override public void onupgrade(sqlitedatabase db, int oldversion, int newversion) { } // add public helper methods access , content database. // return cursors doing "return mydatabase.query(....)" it'd easy // create adapters views. public list<question> getquestionset(int difficulty, int numq){ list<question> questionset = new arraylist<question>(); cursor c = mydatabase.rawquery("select * question difficulty=" + difficulty + " order random() limit " + numq, null); while (c.movetonext()){ //log.d("question", "question found in db: " + c.getstring(1)); question q = new question(); q.setquestion(c.getstring(1)); q.setanswer(c.getstring(2)); q.setoption1(c.getstring(3)); q.setoption2(c.getstring(4)); q.setoption3(c.getstring(5)); q.setrating(difficulty); questionset.add(q); } return questionset; } }
manifest
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.pixy.quiz" android:versioncode="1" android:versionname="1.0" > <uses-sdk android:minsdkversion="8" android:targetsdkversion="8" /> <application android:allowbackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/apptheme" > <activity android:name="com.pixy.quiz.splashactivity" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.main" /> <category android:name="android.intent.category.launcher" /> </intent-filter> </activity> <activity android:name=".questionactivity" /> <activity android:name=".rulesactivity" /> <activity android:name=".endgameactivity" /> <activity android:name=".settingsactivity" /> <activity android:name=".answersactivity" /> </application> <application android:allowbackup="true" android:name="com.pixy.quiz.chuckapplication"/> </manifest>
when you're doing :
try { mydbhelper.createdatabase(); } catch (ioexception ioe) { throw new error("unable create database"); } try { mydbhelper.opendatabase(); }catch(sqlexception sqle){ throw sqle; } you're trying open 2 times database. should have 1 instance of opened @ runtime.
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